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Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
For more information about the recommended memory configurations, please check the Hardware Installation Guide of your Synology product.
Maximum Drive Bays with Expansion Unit
18 (DX517 x 2)
M.2 Drive Slots
Compatible Drive Type*
3.5" SATA HDD
2.5" SATA SSD
M.2 2280 NVMe SSD
Hot Swappable Drive*
Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the The use of non-validated components may limit certain functionality and result in data loss and system instability.
The hot swappable drive feature is not supported by M.2 SSD slots.
"Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
RJ-45 1GbE LAN Port*
2 (with Link Aggregation / Failover support)
RJ-45 10GbE LAN Port
Management LAN Port
USB 3.2 Gen 1 Port*
This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.
For more information on how power consumption is measured, refer to this article.
Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle stae. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
0°C to 40°C (32°F to 104°F)
-20°C to 60°C (-5°F to 140°F)
5% to 95% RH
The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)